Move compiler failure matching logic into failure object

Library/Homebrew/compilers.rb

@@ -48,6 +48,12 @@ class CompilerFailure
     instance_eval(&block) if block_given?
   end
 
+  def ===(compiler)
+    name == compiler.name &&
+      major_version == compiler.major_version &&
+      version >= (compiler.version || 0)
+  end
+
   MESSAGES = {
     :cxx11 => "This compiler does not support C++11"
   }

Library/Homebrew/formula.rb

@@ -231,13 +231,8 @@ class Formula
     self.class.keg_only_reason
   end
 
-  def fails_with? cc
-    (self.class.cc_failures || []).any? do |failure|
-      # Major version check distinguishes between, e.g.,
-      # GCC 4.7.1 and GCC 4.8.2, where a comparison is meaningless
-      failure.name == cc.name && failure.major_version == cc.major_version &&
-        failure.version >= (cc.version || 0)
-    end
+  def fails_with? compiler
+    (self.class.cc_failures || []).any? { |failure| failure === compiler }
   end
 
   # sometimes the formula cleaner breaks things